Net Mux

Also known as the Hedco.

Basic Front Panel Operation

(Straight from the old website)

• Make sure that the controls are enabled by pushing the Panel Enable button until it illuminates.
• Press the Button below the display for the output you want to change (not marked, but 4 of them), which will blank the display and flash the button.
• Press the desired input button (numbered 1 to 16). Number appears in the display, and the Take button at right hand side flashes.
• Press Take to make the change.

Multiple changes can be loaded (indicated by the output button being lit) before all are executed at once by pressing Take.

Card Layout

(Straight from the old website):

The Net Mux has 4 cards on the back - 2 for audio and 2 for video. From 1 to 4 on the control panel they are:

1 - Network Video (i.e. the output goes to the wired network)

2 - Network Audio (audio to the network)

3 - Stream Video (currently goes only to a monitor, but will feed the web stream)

4 - Stream Audio (audio to the stream - currently entirely unconnected)

The card physical layout is independant, with the four cards being Net Audio, Stream Audio, Net Video, Stream Video from top to bottom. Video Inputs

The video inputs are currently the same for the network and the stream. They are:

1 - GFX Comp

2 - DaVE

3 - MUX 1

4 - MUX 2

5 - MUX 3

6 - MUX 4

7 - 11 - empty

12 - reserved for freeview

13 - Tuna

14 - Vidserv

15 - Inform

16- Clock Audio Inputs

The network audio is on D-connectors which are connected to the NetMuxBreakout in the rack. The inputs are:

1 - Sound Desk

2 - Silence

3 - for OB input

12 - Reseved for Freeview

13 - Tuna

14 - Vidserv

Serial Operation

(Straight form the old website)

The mux has a standard RS232 serial port on it, as well as various other (standard but unusual) communications ports. The RS232 is set to run at 19200 Baud, with 8 data bits, 1 stop bit, no parity, no flow control. You'll know if it's wrong, because on typing any character into the ports, you'll get ASCII soup coming back at you.

Information returned via the serial link into hyperterminal when the unit is switched on: (or via typing i)

                       BASIC COMMAND LINE ENTRY SYNTAX

BUFFER [#] [OFF/CLEAR] . . . Set or reset Buffer Mode, clear Salvo Buffer

CLEAR # [,#,...] . . . . . . Cancel crosspoint or clear crosspoint request

DESTINATION # [,#,...] . . . Take crosspoints or set crosspoint request

EXECUTE # . . . . . . . . . Take Salvo Buffer crosspoint requests

INFORMATION . . . . . . . . List system status and operational parameters

LEVEL # . . . . . . . . . . Set current Level number

POLL # . . . . . . . . . . . Poll source connections

QUERY . . . . . . . . . . . List basic Command Line entry syntax

READ . . . . . . . . . . . . List current crosspoint status

SOURCE # . . . . . . . . . . Set current Source number

TERMINAL [ON/OFF] . . . . . Set or clear Echo Mode

VERIFY # . . . . . . . . . . List Salvo Buffer crosspoint requests

XPT [#:] #,# [,#,...] [/...] Set specified crosspoints

ZERO . . . . . . . . . . . . Reset X-plus frame

The key commands are:

• READ to find out the current inputs selected
• LEVEL N to control which of the 4 outputs are selected for alteration
• BUFFER A to assign a buffer to load commands into
• BUFFER CLEAR to empty it
• XPT X,01 to add a command to the buffer for input X
• EXECUTE A to execute queued commands

All commands can be abbreviated to the single initial letter. All commands are executed / loaded by sending a carriage return & line feed, not just one of them. so after "B 02" or "Buffer 02" or anything else, you'll need to send CRLF (\r\n).

A simple example would be:

>BUFFER 02 >BUFFER CLEAR >LEVEL 01 >XPT 03,01 >EXECUTE 02

Which sets output 2 (of 4) to input 3. When the EXECUTE command is sent.

A more complex example, setting outputs 1 and 2 to 5, output 3 to 7 and output 4 to 10, would be:

BUFFER 01

BUFFER CLEAR

LEVEL 00

XPT 05,01

LEVEL 01

XPT 05,01

LEVEL 02

XPT 07,01

LEVEL 03

XPT 10,01

EXECUTE 01

Reading back the status of the cards after this gives us:

>READ

Level 00: 01,05;

Level 01: 01,05;

Level 02: 01,07;

Level 03: 01,10;

with the inputs selected (5,5,7,10) clearly visible.